Re: [DML] Re: pinging and ignition advance

[Jason Ferrara <jason@xxxxxxxxxxxxx>]

I was checking the just the mechanical advance. I had the vacuum line  
to the distributor disconnected (and plugged).
So other than the 2 degrees off at 4000+ RPM, the mechanical advance  
seems to be working correctly. Base timing is also correct.

I guess I'll have to get a vacuum pump to check the vacuum advance.

I know the problem isn't bad gas or overheating. I'm assuming the  
spark plugs are correct, because they were installed by a DeLorean  
vendor. Though they're about 6 years old now.

Any suggestions on what to do about carbon deposits?


On Aug 15, 2006, at 11:26 PM, David Teitelbaum wrote:

> Timing advance can be checked with a tachometer and a timing light.
> Pinging can be caused by bad gas, carbon deposits, overheating,
> running too lean a mixture, wrong spark plugs to name a few causes.
> Total advance (with vacuum AND mechanical) should be 40, not 22. Make
> sure you are getting ALL of your mechanical advance and all of your
> vacuum advance. I have seen where the mechanical advance gets stuck
> and you don't get any and I have seen problems in the vacuum circuit
> and no vacuum advance. One of your timing advance systems is not
> functioning. Very easy to check, disconnect the vacuum line to the
> distributer and see if you get any advance. If you do then you know
> the vacuum is the problem. Verify the markings for TDC on the scale
> and make sure your initial (base) timing is correctly set @ 13
> degrees. Refer to M:01:04 in your Workshop Manual. A vacuum hand pump
> is not expensive and would make it much easier to troubleshoot your
> vacuum circuit.
> David Teitelbaum
> vin 10757
>
>





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